Well, the title is pretty self-explanatory, but I'm gonna give some context:

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My girlfriend is really good friends with this guy from a sports club she takes part on regularly, let's call him Greg. Nothing strange here, I remember being a little jealous when we started dating, but that's about it.

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Now, about a month ago, a girl, who is Greg's ex, called my girlfriend asking her, what kind of relationship she has with Greg, if they we're together or dating. Apparently this girl is a little bit obsessed with Greg. She told my GF not to tell Greg that she called her, and my GF decided not to. Then this girl proceeded to call Greg and tell him she called my GF, and Greg wanted to know what they talked about and so on.

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Sometime after this situation, my girlfriend realized that she actually likes Greg, Now she told me, and is confused about what to do, because she likes me and being with me, but she also likes Greg, and is affecting negatively in our relationship.

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My question is, what should I do in this situation? Obviously I can't take part in whatever she decides to do, but I also don't want her to suffer anymore from this situation, same as me, I want to be with her, but honestly I'm anxious about what might happen.

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TL;DR: My girlfriend likes a friend of hers, has been completely honest about it, but I don't know how to help her and our relationship.